High-voltage filter capacitor group resonant frequency testing device and method

Abstract

The invention relates to a high-voltage filter capacitor group resonance frequency testing device and method. The device comprises an acquisition circuit, a control circuit and a display circuit. Theacquisition end of the acquisition circuit is connected with a high-voltage filter capacitor group, and the output end thereof is connected with the control circuit. A discharge sinusoidal waveform signal of the high-voltage filter capacitor group is acquired and shaped. A pulse signal is output to a control module when the periodic discharge sinusoidal waveform signal crosses zero. The output endof the control circuit is connected with the display circuit. The pulse signal waveform period is calculated and converted into frequency, and a frequency signal is generated and transmitted to the display circuit. The display circuit displays the data of the frequency signal. Compared with the prior art, the device and method, which are provided by the invention, test the high-voltage filter capacitor group, and have the advantages of more accurate test, small volume, light weight, easy carrying, less dependence on field conditions, simple operation and high automation degree.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a device and method for testing the resonant frequency of a high-voltage filter capacitor bank. Background technique [0002] The high-voltage filter capacitor bank used in the power system mainly includes filter capacitor units, series reactors, isolating switches, discharge coils and other main components. Its function is to ensure that the harmonic indicators flowing into the system meet the national standard after the filter is put into operation. Requirements, while providing a certain amount of capacitive reactive power. Usually, the filter capacitor device is provided with multiple branches such as 5th, 7th, 11th to nth order, and the tuning frequency corresponding to each branch is n×50 Hz. Due to the lack of relevant instruments and equipment to test the resonant frequency of each branch after the device is installed on site, at present, in most cases, it is estimated b...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-voltage filter capacitor bank resonant frequency testing device and method. The technical problem to be solved is: there are large errors in the operation mode through estimation rather than actual testing, and the actual resonant frequency often deviates from the design requirement range , causing the filtering effect of the filtering device to be greatly reduced, and even fail to meet the design requirements

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